Correction

Jan. 1, 2012 at 1 p.m.Updated Dec. 31, 2011 at 7:01 p.m.

• Chronic Myeloid Leukemia is an uncommon type of leukemia, making up about 15 percent of all cases of leukemia among adults, according to a study by the Novartis Pharmaceuticals Corporation. People of any age can develop the leukemia, but it is most common in adults 50 years of age and older. Although CML may also be seen in children, it is very rare, accounting for fewer than 50 cases of childhood leukemia each year in the United States, according to a study by the Nemours Foundation. This information was incorrect in a story on Page A1 on Sunday.